#include "RTClib.h"
RTC_DS1307 rtc;
const int dataPin = 2; //DS
const int clockPin = 3; //SHCP
const int latchPin = 4; //STCP
const byte digiPatterns[10]={
  B00111111, // 0
  B00000110, // 1
  B01011011, // 2
  B01001111, // 3
  B01100110, // 4
  B01101101, // 5
  B01111101, // 6
  B00000111, // 7
  B01111111, // 8
  B01101111  // 9
};
void setup() {
  if (! rtc.begin()) {
    abort();
  }
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
}
void loop() {
    // Date
    for (int i = 0; i < 3; i++) {
    DateTime now = rtc.now();
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[( now.year() + 543 ) % 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[(( now.year() + 543 ) / 10) %10 ]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[now.month() % 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[now.month() / 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[now.day() % 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[now.day() / 10]);
    digitalWrite(latchPin,HIGH);
    delay(1000);
    }
    // Time
    for (int i = 0; i < 3; i++) {
    DateTime timeNow = rtc.now();
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[timeNow.second() % 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[timeNow.second() / 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[timeNow.minute() % 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[timeNow.minute() / 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[timeNow.hour() % 10]);
    shiftOut(dataPin,clockPin,MSBFIRST,digiPatterns[timeNow.hour() / 10]);
    digitalWrite(latchPin,HIGH);
    delay(1000);
    }
}